Oven



June 10, 1930. R. E. CRAMER OVEN Filed May 18, 1929 3 Sheets-Sheet 1'EOBZET E. CEWMEE, /x M June 10, 1930. R. E: CRAMER OVEN Filed May 18,

1929 3 Sheets-Sheet 2 June N), 1930. R E CRAMER 1,763,418

OVEN

Filed May 18, 1929 5 Sheets-Sheet 3 1200621! or: FOEEET [:T 654M518Patented June 10, 1930 UNI T D I OFFICE OVEN Application filed May 18,

This invention relates to ovens and, while not limited thereto, relatesto rod baking and drying ovens and the like, and has for one of itsobjects the provision of a novel heating arrangement whereby heated airis constant- I 1y recirculated through the oven sub-chamers.

Another object is to provide for the forced circulation of heated airthrough the oven chambers so as to cause an even heating of the ovenchambers.

In the drawings Figure 1 is a plan, partly in section, of an ovenconstructed in accordance with this in-.

vention.

Figure 2 is an elevation, taken on the line Tl[-l[I of Figure 1.

Figure 3 is a sectional elevation taken on the line III- HT ofFigure 1.

eferring more particularly to the drawings, the main oven chamber hasend walls 2 and 3, and top wall 4:, which may be of brick or other usualconstruction with or without a layer of heat-insulating material 5, asdesired. The back and front of the oven chamber are closed by doorswhich are slidably mounted in guides 7 for vertical movement to permitbuggies loaded with rods.

Suitable overhead tram-rails 8 are mounted along the back and front ofthe oven and each tram-rail carries a hoisting apparatus 9 adapted to bedetachably connected to the respective doors for raising and loweringsaid doors.

The main oven chamber is divided from front to back into sub-ovenchambers A by hollow partition walls B, portions of which serve as fluesfor the circulation of air through the oven. The walls 18 are composedof spaced rows of columns 10 covered With metal plates 12 forming spacedside walls. The spaces between the side walls of the partitions B aredivided intermediate their ends by transverse plates secured to thecenter column of each partition, as at 13, so as to form separate flues.

The end walls of the oven chamber are each provided with an inwardlyspaced plate lining 14 along half of their length so as to the chargingand dischargingof 1929. Serial No. 364,234.

provide end flues 15 for the circulation of air from the endmostsub-chambers A.

Suitable heating units D are mounted on the top of the main oven chamberand are arranged in pairs over the partition walls B 7 one over each ofthe flue portions thereof, and single units are mounted over the endflues 15. The heating units comprise a vertically disposed casing member16, the lower end of which is open and communicates with the flueportion of the wall over Which it is mounted. The separate flue portionsof the walls B are provided with elongated ports 25 adjacent their lowerends, the forward flue portion vhaving its port 25 opening into thesub-chamber A on one side of the wall, and the rear flue portion havingits port 25 opening into the sub-chamber A on the other side of thewall, so that each sub-chamber is provided with exhaust ports in itsopposite walls. The endlnost sub-chambers have one exhaust port 25 inthe flues 15. A steam coil 17 is mounted in the casing 16 to heat theair drawn therethrough. A pair of fans 18 are mounted in the upper endof the casing and are adapted to be operated by a motor 19. The fans 18have their inlet ports 20 opening into'the casing 16 and their outletports opening into a conduit 21 forming a hot air flue. The conduit flue21 extends down through the top of the oven and com municates with thesub-chamber A from which the air is drawn to be heated. From the aboveit will be seen that each subchamber A is served from opposite sidesadjacent opposite ends by separate heating units D which cause aconstant recirculation of heated air throughout the sub-chambers.

The steam coils 17 of the heating units D are adapted to have theirinlets connected to a suitable supply main (not shown), and the outletsof suitable drain main (not shown);

The top wall of the oven above each of the sub-chambers A is providedwith normally closed vents 26 through which portions of the airbeingcirculated may be allowed to escape when the humidity of the airbecomes too great. Normally closed and controllable inlet openings 27are also provided said coils are connected to a adjacent the lower endof each of the heater casings 16 through which fresh air may be admittedto the circulating system, when desired, to make up for the humid airpermitted to escape through the vents 26 or to control the temperatureof the air being circulated.

The type of rod baking and drying oven has a materially greater bakingand drying capacity than the direct fired ovens of the prior art, due tothe fact that a more uniform temperature is maintained throughout theoven compartments or sub-chambers. No labor is required for firing ormaintaining the ovens since they receive their heat from the centralsteam plant. The expensive repairs necessary in the direct fired ovens,partly made necessary by the fact that the products of combustion mustat all times be kept from entering the oven chambers, are entirelyeliminated. Many other advantages such as low first cost and generallyimproved operation will also be apparent to those skilled in the art.

While I have shown and described one specific embodiment of myinvention, it will be understood that I do not Wish to be limitedthereto since various modifications may be made Without departing fromthe scope thereof, as defined in the appended claims.

.I claim: v

1. A rod baking and drying oven comprising a rectangular main ovenchamber divided into a plurality of sub-chambers by partition'walls,means for heating and circulating the air in each of said sub-chambers,said means withdrawing the air from each subchamber from a point alongone side wall to the rear of the transverse center of said sub-chamberand from a point along the other side wall forward of the transversecenter of said sub-chamber, and returning the air heated to the upperpart of said sub-chamber from which it is withdrawn at points to therear and forward of its transverse center.

2. A rodbaking and drying oven comprising a rectangular main ovenchamber divided into a plurality ofsub-chambersbyhollowpartition walls,said walls being separated vertically intermeidate their ends to formseparate vertical flues, said walls being provided with openings intheir opposite faces on the opposite sides of said vertical separation,said openings forming ports to the respective flues from thesub-chambers on the opposite sides of said wall whereby each subchamberis provided with a flue port in each side wall extending inwardly fromits end toward the center, at least two heater units for causing acirculation of and heating the air of each of said sub-chambers, each orsaid units comprising a casing through which air is adapted to be drawn,a steam coil in said casing, and an exhaust fan for drawing air throughsaid casing, one of said units havmg its casing in communication withthe partition wall flue at one side of said chamber my hand.

ROBERT E. CRAMER.

